PeopleofSuperintelligence

Researcher

Etienne Lefebvre

Also known as Étienne Lefebvre

Etienne Lefebvre is a researcher whose Louvain method finds communities in large networks. He developed it during an applied-mathematics master's project at the Catholic University of Louvain in 2007 and coauthored English and French papers about it in 2008. Its project offers original and updated C++ code, and a partition-stability implementation builds on Louvain code credited to Lefebvre and Jean-Loup Guillaume; the method's name first appeared in print in September 2009. The 2008 paper had 20,054 Google Scholar citations by July 2023, and a 2023 review thanked Lefebvre for originating the method. In October 2023, he was a Senior Project Manager at EQUANS Offshore.

Works
3
Citations
21,498
h-index
2

Publication numbers from OpenAlex, as of 22 October 2026.

Timeline

  1. 2007

    A Louvain master's project

    In 2007, the Louvain method develops during Etienne Lefebvre's applied-mathematics master's project with three researchers at the Catholic University of Louvain. His project starts from synthetic networks with communities; by reversing the process, he discovers the method.

  2. 2008

    Fast unfolding communities

    In 2008, he coauthors “Fast unfolding of communities in large networks,” a heuristic that extracts communities through modularity optimization. The paper tests it on a Belgian mobile-phone network with 2.6 million customers and a web graph with 118 million nodes and more than one billion links. The Louvain project offers original and updated C++ code, and a partition-stability implementation builds on Louvain code credited to him and Jean-Loup Guillaume.

  3. 2008

    A French conference paper

    At ALGOTEL in 2008, he coauthors the French-language paper “Identification multi-échelle de la structure communautaire de très grands graphes” with Vincent D. Blondel, Jean-Loup Guillaume and Renaud Lambiotte.

  4. September 2009

    Naming the Louvain method

    The term “Louvain method” first appears in an article published in September 2009.

  5. July 2023

    20,054 Google Scholar citations

    On July 6, 2023, the 2008 paper reaches 20,054 Google Scholar citations.

  6. 2023

    A review of the Louvain method

    The authors of a 2023 review thank him for originating the Louvain method and note it remains his only publication as a master's student. The review describes the method as implemented in standard graph-mining libraries and at the core of network science.

  7. October 2023

    Senior project manager at EQUANS

    In October 2023, he is a Senior Project Manager at EQUANS Offshore.

Career

  1. EQUANS OffshoreSenior Project Manager

Education

  1. 2007UCLouvainMaster's

From the biography.

  1. More people shaping AI studied at Massachusetts Institute of Technology than at any other institutionIncludes UCLouvain. We estimate where the people shaping AI studied and where their careers led. Massachusetts Institute of Technology leads with 467 former students, including 291 recorded doctorates.
  2. The company share of AI researchers’ top papers was 31% in 2020–2024 and 8% in 1970–1974Includes UCLouvain. We estimate where the people shaping AI worked when their most-cited papers appeared: the company share was 31% in 2020–2024 and 8% in 1970–1974, and Google led all organizations in 2020–2024.
  3. The Massachusetts Institute of Technology trained or employed 44 of the 187 AI major-prize winners, more than any other universityIncludes UCLouvain. The Massachusetts Institute of Technology trained or employed 44 of the 187 AI major-prize winners, more than any other university. We compare doctorate and 5+ year employment links, career timing and current workplaces for 187 major-prize and 1,111 best-paper winners.
  4. Google had the most people shaping AI every year from 2014 to 2025Our estimates of which organizations employed the most people shaping AI each year from 1955 to 2025, tracing the shift from university labs to companies.

Colleagues

People named in this biography, and people with dated positions at the same organization in the same years.

Sources and credits

Photo: We have no published photo of Etienne Lefebvre yet. Send us a free-licensed photo.

  1. Jean-Loup Guillaume - La Rochelle Université univ-larochelle.fr. Checked 22 October 2026.
  2. Fast unfolding of communities in large networks arxiv.org. Checked 22 October 2026.
  3. Louvain method: Finding communities in large networks sites.google.com. Checked 22 October 2026.
  4. Partition Stability michaelschaub.github.io. Checked 22 October 2026.
  5. Jean-Loup Guillaume publications jlguillaume.fr. Checked 22 October 2026.
  6. Fast unfolding of communities in large networks: 15 years later arxiv.org. Checked 22 October 2026.